Thread storage disc for two-for-one twisting spindles



G. FRANZEN 353622 5 THREAD STORAGE DISC FOR TWO-FOR-ONE TWISTING SPINDLES Jan. 9, 1968 Filed Jan. 7, 1966 United States Patent 3,362,151 THREAD STORAGE DISC FOR TWO-FOR-ONE TWISTING SPINDLES Gustav Franzen, Neersen, near Krefeld, Germany, assignor to Palitex Project-Company G.m.h.H., Krefeld, Germany Filed Jan. 7, 1966, Ser. No. 519,328 Claims priority, application Germany, Jan. 15, 1965, P 35,880 9 Claims. (Cl. 5758.84)

ABSTRACT OF THE DISCLOSURE The present invention relates to a combination with a spindle rotor of a two-for-one twisting machine having thread outlet means in said rotor with a thread storage disc structure which is characterized primarily by the provision of two discs, one arranged below the other in axially spaced relationship to each other while strip means having an outer surface of high wear resistant material are arranged between and connected to said discs. The said strip means includes a first portion of annular contour extending around said rotor in radially spaced relationship thereto, and also includes a second portion extending from said first portion in radial direction inwardly toward said rotor within the range of said thread outlet means in said rotor to form thread exit passage means for the thread leaving said thread outlet means.

The present invention relates to a thread storage disc for two-for-one twisting spindles. With two-for-one twisting spindles, the so-called thread storage disc forms a part of the spindle rotor. The thread which passes from above through the hollow shaft of the spindle in downward direction moves radially through a thread exit passage out of the thread storage disc and then rotates together with the spindle rotor in the form of a balloon around the stationary bobbin while moving upwardly to the winding-up bobbin while passing through a centrally arranged thread guiding member.

Prior to detaching itself from the thread storage disc, the yarn leaving the thread storage disc normally embraces the thread storage section of the thread storage disc at least by 180, frequently by more than 360. The frictional retaining force thus exerted by the yarn in looping engagement with the thread storage disc acts in a direction opposite to the centrifugal force of the yarn while passing through its balloon-shaped path and acts almost without inertia in an equalizing manner upon the thread tension because the magnitude of the looping of the yarn around the thread storage disc adjusts itself automatically in conformity with the speed and the thread tension and in conformity with the coefiicient of friction.

The thread exit passage as well as the thread storage section of the thread storage disc are subjected to a considerable wear by the passing yarn, and this wear will after a period of time actually cause grooves to appear in the material of the thread storage disc, unless such disc is made of a particularly surface wear resistant material.

Heretofore knownthread storage discs are in most instances made at least at the respective parts of an aluminum alloy which is provided with an eloxated layer. The operation necessary to provide the thread storage disc with such layer is rather expensive. Similar remarks also apply to thread storage discs with a surface of chromium. A particular disadvantage is seen in the fact that when a wear at the surface of the thread storage disc occurs and as a result of a damage to the thread 3,352,151 Patented Jan. 9, 1968 storage disc by the thread in the thread exit passage, it is necessary as a rule to exchange the entire thread storage disc.

It is, therefore, an object of the present invention to provide a thread storage disc for two-for-one twisting spindles, which will overcome the above-mentioned drawbacks.

It is another object of this invention to provide a thread storage disc for two-for-one twisting spindles which will have a thread storage section with at least one radially extending thread exit passage, above which the outwardly curved thread deflecting flange extends, which will permit a manufacture of the thread storage disc at a considerably lower cost than heretofore known discs of the type involved while permitting an exchange of only those sections which in particular are subjected to a wear.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawing, in which:

FIG. 1 illustrates partly in section and partly in view a thread storage disc according to the invention with a cylindrical thread storage section, said disc being mounted on a spindle pipe.

FIG. 2 is a section through a modified thread storage section with a conical flare in upward direction.

FIGS. 20, 2b and 20 respectively illustrate sections through modified cross sectional shapes of a thread storage section.

FIG. 3 is a partial section in the plane of the exit passages of a thread storage disc according to FIG. 1.

FIG. 4 illustrates the total of the parts of the thread storage section according to FIG. 3 but on a reduced scale with regard to the latter.

FIGS. 5 and 5a respectively illustrate parts of a thread storage section of modified thread storage discs.

The arrangement according to present invention is characterized primarily in that the thread storage disc comprises an upper deviating flange disc and a second smaller disc axially spaced from the first disc and connected to the spindle rotor, the thread storage section being formed by at least one strip of a material having a high surface wear resistance. This strip extends along both discs while leaving free the thread exit passages.

This subdivision of the thread storage disc into individual discs which are connected only by the assembly of said discs affords the possibility to employ a material for said two discs which is relatively inexpensive and the surface of which does not require any treatment or processing. Solely for the thread storage section there is employed a strip which consists of a material of high sur face wear resistance and which extends along said discs while leaving free the thread exit passages. The said discs are connected to the spindle rotor as separate parts. Thus, only the thread storage section consists of expensive material, in other words, only the thread storage section has a high surface wear resistance while such special treatment of the other sections is not required. As material of high surface wear resistance there may be employed for instance eloxated aluminum, chrome-plated steel sheet, bimetal, one or more layers of synthetic materials, such as polytetrafiuoroethylene, sheet metal with a layer of synthetic material, as for instance ethylene glycol adipinic acid polyester synthetic material, such as the aforementioned materials, with a layer for instance of chromium or nickel, or strips with ceramic coating or cover.

More specifically, the thread storage section according to the present invention may be composed of two strips of high surface Wear resistance the ends of which are (2 bent radially inwardly to form the thread exit passages. In such an instance, the thread storage disc has two thread exit passages extending along a diameter line, one of said passages being employed for the thread exit. By bending the ends of the strips inwar 1y, these ends form the lateral surfaces of the thread exit passages so that these passages will have the same surface property or the same wear resistance as the thread storage section which is formed by the two strips. According to the above outlined features of the present invention, thread storage sections of different cross section and diflerent surface property can be obtained. According to one embodiment of the invention, the strips may be bent cylindrically. According to another embodiment of the invention, the strips may be so bent that the thread storage section flares upwardly in a conical manner.

According to still another embodiment of the present invention, the strips are bent so as to form a polygon. According to a further development of the invention, the strips of the above mentioned three embodiments may have their outside provided with axial ribs or the like, thereby improving the adherence of the thread passing therearound prior to the detachment of the thread from the thread storage disc.

In order to assure that the deviating areas at the thread exit passages are particularly wear resistant, at both sides in the exits of the thread exit passages, axially directed wear resistant bodies may be arranged by means of which the yarn is deviated from the radial direction into the tangential direction with regard to the thread storage disc.

Also other forms are possible, for instance in such a way that the thread when being looped around a thread storage section Will be given a certain direction in this section. To this end, the strips may have a longitudinal trough-shaped section.

Referring now to the drawings in detail, and FIG. 1 thereof in particular, FIG. 1 comprises a spindle rotor 1 having mounted thereon an upper deviating fiange disc 2 with a hub 3. The outer marginal portion of disc 2 is in customary manner bent upwardly. Below said disc 2 and in axially spaced relationship thereto, spindle rotor 1 has mounted thereon a second disc 4 with a hub 5. As will be seen from the drawing, disc 4 has a considerably smaller diameter than disc 2. The outer marginal area of second disc 4 has a groove 6 in which is inserted a strip 7 forming the storage section of the thread storage disc. This strip 7 may be composed of two individual strips 7a, 7b, the ends of which within the range of the thread exit passages 8 may, in conformity with FIGS. 3 to 5, be bent radially inwardly. The free radially inwardly bent ends 9 of strips 7 extend closely to the spindle rotor 1 which latter within the range of the inner ends of thread exit passages 8 has perforations 1a through which the thread may pass from the inside toward the outside. The upper marginal portion of strip 7 engages a groove 10 in the bottom side of deviating flange disc 2 so that the said disc 2 is connected to the second disc 4 by means of said strip 7. The two discs 2 and 4 are firmly connected to the spindle rotor 1 for instance by cementing the hubs 3 and to the spindle rotor 1. It is, of course, also possible to connect the two discs 2 and 4 to spindle rotor 1 in any other convenient manner, for instance by threading said discs onto the rotor.

FIG. 2 shows a modification inasmuch as strip 7 of .FIG. 1 has been replaced by a strip 7c which flares in upward direction in a conical Way. With the embodiment of FIG. 2, the upper marginal portion of strip 70 will engage groove in disc 2 whereas the lower marginal portion of strip 70 will engage a groove 6 in disc 4.

With the embodiments illustrated in FIGS. 2a to 20, the strip 7 of FIG. 1 has been replaced by a strip 7d, 7 and 7g respectively which form a more or less deep groove or trough. More specifically, according to FIG. 2a the said trough 7d has a semicircular cross section and has its outer surface covered by a layer 14 of a different material. The said layer of different material may consist of synthetic material, such as polytetrafi'uoroethylene, or may form a layer of a metal, such as chromium or nickel.

The trough according to FIG. 215 has a flat angle cross section whereas the trough of FIG. 2: has a hyperbolashaped cross section.

As will be evident from FIGS. 3 to So, at the exit ends of the thread exit passages 8 there are on both sides provided special wear resistant bodies 12 by means of which the yarn 13 when leaving said passages will be deviated from its radial extension and will engage strip 7.

According to FIG. 5, strips 7 are bent so as to form a portion of a polygon. The arrangement of FIG. 5a corresponds to that of FIG. 5, while, additionally at the ends of said polygonal section, strip 7 is provided with axially directed ribs 11.

As material for strips 7 is preferably employed aluminum or steel sheet while at least the outer surface is provided with a particularly good wear resistant surface. This surface, when employing aluminum, may be eloxated, and when employing steel, may preferably be hard chromium plated. This wear resistant layer is also provided at the ends 9 of strip 7 Within the range of the thread exit passages 8.

As will be evident from the above, the manufacture of a thread storage disc according to the present invention and composed of a plurality of parts is considerably simpler than the one-piece heretofore known thread storage disc which had to be covered all over with a wear resistant surface. In contrast thereto, according to the present invention, only the strips 7 have to consist of a more expensive wear resistant material or have to be covered with a layer of such material.

It is, of course, to be understood that the present invention is, by no means, limited to the particular arrangements and designs shown in the drawing but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. In combination with a spindle rotor of a two-for-one twisting machine having thread outlet means in said rotor, a thread storage disc structure which includes: a first disc having an outer peripheral thread deflecting flange and being mounted on said spindle rotor for rotation therewith, a second disc arranged below said first disc and in axially spaced relationship thereto and being connected to said rotor for rotation therewith, said second disc having an outer diameter less than the outer diameter of said first disc, and strip means having an outer surface of a high wear resistant material, said strip means extending between and being connected to said first disc and said second disc and including a first portion of annular contour extending around said rotor in radially spaced relationship thereto and also including a second portion extending from said first portion in radial direction inwardly toward said rotor within the range of said thread outlet means in said rotor to form thread exit passage means for the thread leaving said thread outlet means.

2. An arrangement according to claim 1, in which said strip means comprises two strips having the end portions thereof directed inwardly toward said rotor and spaced from each other so as to form said thread exit passage means.

3. An arrangement according to claim 1, in which said strip means comprise portions following the contour of a cylinder.

4. An arrangement according to claim 1, in which said first portion of said strip means is conical and tapers in the direction from said first disc toward said second disc.

5. An arrangement according to claim 1, in which said first portion of said strip means has a polygonal contour.

6. An arrangement according to claim 1, in which the outer circumferential surface ofsaid strip means is provided with ribs extending in axial direction of said rotor.

7. An arrangement according to claim 1, in which said strip means comprises two strips having the end portions thereof directed inwardly toward said rotor and spaced from each other so as to form said thread exit passage means, wear resistant means arranged at the outwardly located ends and on opposite sides of said passage means while extending in axial direction of said rotor.

8. An arrangement according to claim '1, in which said strip means have a trough-shaped cross section with the axis of the trough extending in a plane substantially perpendicular to the longitudinal axis of said rotor.

9. An arrangement according to claim 1, in which said first and second discs have those surfaces thereof which face each other provided with annular groove means, said strip means being inserted into and held in said groove means.

References Cited UNITED STATES PATENTS 2,013,023 9/1935 Bochmann et a1. 5758.84 2,732,681 1/1965 Klein 5758.84 3,299,623 1/1967 Keyser 5758.49

FOREIGN PATENTS 706,224 5/ 1941 Germany. 961,853 6/1964 Great Britain.

FRANK I. COHEN, Primary Examiner.

D. WATKINS, Assistant Examiner. 

